crank

Where can I get a crankshaft extension sleeve for a 2 stroke 8Occ chinese motor? It did NOT come with the clutch kit I purchased online. If someone could please let me know where I can buy one, contact me at woodenships97@gmail.com or message me directly. Thank you.
P.S. - thank you Fabian F...

I broke down my engine to replace bearings and go to put it back together and when I tighten up the screws fir the case it makes my crank not move good, like it's rubbing. I loosen screws and it frees up. Please help